- 1.Male or female patients whose specific ages are > 50 years old, in general health. 2.Must be ambulatory (assistive devices allowed) 3.Patient was diagnosed as OA of knee joint by American College of Rheumatology (ACR) criteria ; [ ie,knee pain, and any one of the following:age>50 years,crepitus, or morning stiffness<30 minutes in duration ] 4.Radiographic confirmation of OA with Kellgren-Lawrence Ⅱ-Ⅲ score (mild to moderate)at the target joint (anterior-posterior views) with predominance in the tibia-femoral compartment 5.VAS score ≧40 mm for 50 foot of walking pain.